<template>
  <div class="my-tab-bar">
    <!-- 渲染页面 设置底部导航栏的点击事件 和高亮样式 -->
    <div class="tab-item" v-for="(item, index) in list" 
    :key="index"
    :class="{ current: activeIndex === index}"
    @click="ChangFn(index,item.componentName)">
      <!-- 图标 -->
      <span class="iconfont" :class="item.iconText"></span>
      <!-- 文字 -->
      <span>{{ item.text }}</span>
    </div>
  </div>
</template>

<script>
export default {
    //接收App父组件传来的list
  props: {
    list: {
      type: Array,
      required: true,
      // 自定义校验规则
      validator(val) {  
        // val就是接到数组
        if (val.length < 2 || val.length > 5) {
          return false; 
        }
        return true;
      },
    },
  },
  data(){
    return{
        activeIndex:0 // 高亮元素下标
    }
  },
  methods:{
    ChangFn(index,componentName){
        this.activeIndex = index,  // 点谁, 就把谁的索引值保存起来
        this.$emit('ChangName',componentName)  // 向App.vue传要切换的组件名
    }
  }
};
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

.current {
  color: #1d7bff;
}
</style>